Rotary knob



FIG. 1 is a perspective view of a rotary knob;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof, which is a mirror image of the bottom view;

FIG. 4 is a bottom view thereof, which is a mirror image of the top view;

FIG. 5 is a left side view thereof, which is a mirror image of the right side view; and,

FIG. 6 is a right side view thereof, which is a mirror image of the left side view. 

CLAIM The ornamental design for a rotary knob, as shown and described. 